Disney is working to find the cross necklace containing Chastity Foster's 17-year-old daughter's ashes that were lost during the Princess Half-Marathon.

A Georgia woman is asking for the public’s help to find a necklace that contains her daughter’s ashes. She lost the item while running in the Disney Princess Half Marathon in Florida this weekend.

Chastity Foster, of Augusta, posted on her Facebook that the gold necklace is still missing following Sunday’s race in Orlando. Her daughter, Shaylin, 17, was killed in a car crash last month. The mother wrote her daughter was planning on running the race.

Her father wore the Disney princess costume she was planning to wear on the day of the race in memory of his daughter.

Foster told ABC News she was at first “hesitant” to wear the necklace with her daughter’s ashes but she “wanted her daughter to be there with her as she ran.”

"She [Shaylin] was a very fast runner. She was involved in soccer, cross-country and track," Foster told ABC News.

She said she also made sure her husband checked the necklace to see if it was secured on properly.

"I had my husband double-check to make sure the necklace was on properly because I didn't want it to fall off," Foster said. "During mile three, I realized the necklace was missing. It's devastating to lose any child and then to lose the necklace I started freaking out."

Foster said she believes she lost the necklace while walking from the parking lot to the entrance of Magic Kingdom, where the race took place.

After realizing the cross necklace was gone, family and friends helped her look for it but had no luck.